No offense, but peak cfm's are NOT a judge of a cylinder heads ability to make power. Whether that's your opinion or his, either way it's wrong. There is no magic formula that says "+60cfm is a 120HP net gain." Does he have extensive experience with LT1 heads?

Mid 400s (assuming RWHP) is very unlikely given your situation. However I'd love for you to prove me wrong.

 

lol gawd no!. we were figuring air speed to fill cylinders and piston speed and rpm needed and a bunch of old builds he has done in the past..

experience? yes and i'll leave it at that.

if i can't get into the 400's then i'll disprove it by acceleration and track times..

my pos 306 made 371rwhp and ran 11.19 at 117mph in a daily driven 88gt mustang so i'm hoping my chevy bretheren won't disappoint either...

 

I didn't say 400s...I said MID 400s. Massive difference.

Just sayin'.

Mustangs are not LT1s. Neither is HP an accurate measure of how fast a car can go.

 

no it's not..a dyno and aflow bench can't go down a track...i can only use them as for what they were intended for a measuring tool...i have seen cars dyno 310rwhp and run the 1/4 mile in the 10's...

i'm far from arguementive...i only use my ol ford engine as to say no matter what brand of engine the experience backing you,and seat time you can bring to the table is what's going determine whether it will be a turd or a rocket...

 

ok one more question...@RamAir95TA what did your AI heads flow?

@BW_hunter what did your mph heads flow...i just want to compare what i'm working with to what you guy's are working with...

 

OK, my heads are stock castings ported by More Performance in North Carolina. I don't think they survived the economy. Anyway, they have 2.00" intake and 1.60" exhaust valves

Valve lift Intake Exhaust
0.100 67 53
0.200 134 118
0.300 208 169
0.400 252 183
0.500 279 194
0.600 290 201

They were flowed on a SF-600 bench at 28" of water. I'm not sure you can really compare number across machines, just look at the trend. I also don't think these are as good as AI heads but do think they are better than LE's. Of course, that's opinion...

I run the GM 846 cam that was made by Crane under the part number HR 284-2S-12 IG. It's max valve lift is .543" intake. .563" exhaust with a lobe separation of 112 degrees and a intake centerline of 107 degrees. With this setup I have about 14 inches of vacuum and it idles nicely at 900rpm.

I hope this helps...

 

 

Interesting. When you look at the numbers, Joe's heads flow about the same as mine. With the same cam and compression, the difference between our engines would be the difference in displacement...about 9.4%. But as you can see from the signatures, Joe makes 13.5% more power at peak. That's the value of matching the cam to the heads to the rest of the engine....

the difference is probably bigger than those numbers show. The best 1/4-mile I've done is 11.81 at 114mph ...Joe's in the 10's

 

It's also not about flow numbers entirely. There are other things that affect how the head performs, most notably how the test was conducted, whether it was flowed with a pipe (among other things), port shape, volume, etc.

 

That is awesome you two. This is was for informational purposes
Only. I love info! I'm pretty sure the VE was the same for the fact
That when a good head builder ports around max VE and air speed
Without going turbulent usually your cfm will be where it needs to be


Hopefully ill be right behind you guys and thanks for sharing